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P5 chipboard on suspended floor


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Hi everyone,
I have a question regarding putting P5 moisture resistant chipboard on the suspended flooring of the ground floor. I've already done so on the first floor instead of flooring boards and was very happy with the outcome ( cost effective, even floor, no hassle). But I'm not sure about doing the same on the ground floor. The distanсe to the ground is 40 cm (16 inches) and the soil doesn't look wet at all. I also plan to put a frame of timber along the walls.
The old joists are rotten away (I assume it's because there was no damp proof under the laminate). 
So the question is if it's ok to put P5 chipboard on the ground floor and if so, can I use 18 mm ones or 22mm only?
 

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